TheancientGreeksdiscoveredthem,butitwasn'tuntilthenineteenthcenturythatirrationalnumberswereproperlyunderstoodandrigorouslydefined,andeventodaynotalltheirmysterieshavebeenrevealed.InTheIrrationals,thefirstpopularandcomprehensivebookonthesubject,JulianHaviltellsthestoryofirrationa